dlm: print log message when cluster name is not set

Print a message when a cluster name is not specified by
the caller.  In this case the cluster name configured
for the dlm is used without any validation that it is
the cluster expected by the application.
Signed-off-by: Zhu Lingshan <lszhu@suse.com>
Signed-off-by: David Teigland <teigland@redhat.com>

fs/dlm/lockspace.c

@@ -453,6 +453,10 @@ static int new_lockspace(const char *name, const char *cluster,
 			*ops_result = 0;
 	}
 
+	if (!cluster)
+		log_print("dlm cluster name '%s' is being used without an application provided cluster name",
+			  dlm_config.ci_cluster_name);
+
 	if (dlm_config.ci_recover_callbacks && cluster &&
 	    strncmp(cluster, dlm_config.ci_cluster_name, DLM_LOCKSPACE_LEN)) {
 		log_print("dlm cluster name '%s' does not match "